Brake shoe key retainer



Sept. 12, 1939. 0.12. MITCHELL BRAKE SHOE KEY RETAINER Filed Nov. 8, 1937 Patented Sept. 12, 1939 UNITED STATES PATENT OFFICE BRAKE SHOE KEY RETAINER ()rmali R. Mitchell, Chicago, Ill., assignor to Pullman-Standard Car Manufacturing Company, Chicago, 111., a corporation of Delaware Application November 8, 1937, Serial No. 173,322

17 Claims. (Cl. 188-240) This invention relates to railway car brakes shoe side of the brake head, and lockwashers 21, with particular reference to the connection beunderlying the heads of the bolts, prevent retween brake head and brake shoes. verse rotation thereof; and tapered nuts 28 se- The principal object of the invention is the cure the bolts in place against the action of the provision of removable abutment means for respring lockwashers. The tapered nuts 28, seat- 5 taining a brake shoe key between a brake head ing in the conical bearings 29 in the extensions and brake shoe. 23 and 24, are self-locking, and the frictional Another object of the invention is the proengagement afforded by the conical bearing will vision of a brake head accommodating two brake prevent reverse rotation thereof. The extensions l0 shoes with separate keys for each inserted be- 23 and 24 and the bolts 25 are so disposed that tween the respective shoes and head in opposing the heads 26 of the bolts overlie the keyways relation and having removable abutment means for keys 20 and 2| so that a positive abutment on the head for retaining each key. is provided preventing accidental escape of the The specific object of the invention is the keys. The lockwashers 21 have the further funcl5 provision of a brake head having a brake shoe tion of serving to cause the bolt heads 25 furremovably attached thereto by a key and havther to overlie the keyways positively to prevent ing a bolt acting as an abutment to retainthe any possibility of the keys escaping past the key properly in position. bolt heads. The heads 26 of the bolts are square The foregoing and other objects are attained and disposed in close engagement With the heads by the mechanism illustrated in the accompany of the brake shoe keys, which, as will be seen 20 ing drawing, in which from Fig. 2, are of substantial width so that when Fig. 1 is a general View of a brake head ernit is desired to remove the bolts to permit bodying the principle of this invention, sus- Withdrawal of the keys 2!} and 2|, rotation of the pended from a truck frame in position to enbolts, as the tapered nuts 28 are loosened, will 25 ease the car wheel, and p be prevented by virtue of such engagement be- 25 Fig. 2 is a fragmentary, perspective view of tween the bolt heads and the brake shoe keys, one end of a brake head and shoe and showing and the rebent portions of the brake shoe keys the brake shoe keyretaining means in detail. Will facilitate this action by engagement with In the drawing, the brake head I0 is supported the ends of the brake heads to act as a positive 30 in the plane of the car wheel 13 from the truck lock between the bolt heads and brake head and 30 frame H by a brake hanger l2 pivotally conthereby prevent turning of the bolt head. The nected to the frame at 9. The head it? is pivrebent heads 22 also facilitate removal of the otally connected to the hanger [2 intermediate keys by providing secure purchase for a tool inthe ends thereof, as at M, and the lower end of sorted for this purpose.

shown) for applying the brakes. The head it, prevent Withdrawal of the brake shoe keys until as shown, is of the type accommodating two after the bolts themselves have been removed and brake shoes l6 and i1, although the invention is without penetration of the key or direct conequally applicable to a brake head having but a nection in any manner, but by merely blocking single shoe. The shoes 16 and IT each interlock the normal path of movement of the keys. While 40 with the head Ill as at l8 and i9, and keys 2!] the effectiveness of the device with respect to and 2 l, penetrating the interfitting parts of the the lower inverted key will readily be appreciated, respective shoes and head, secure their interit is equally effective in preventing the creeping locking relation as in usual practice. The keys action which heretofore has frequently resulted 2B and 2! are inserted into the assembly in opin actual loss of keys inserted from the top of 45 posing relation-the key 20 from the top, as the brake head. While the extensions for the in a single shoe type of brake-head, and the key accommodation of the removable bolts appre- 2! from an inverted position from the bottom. ciably lengthen the brake head, it is readily ap- The keys 20 and 2! are each provided with a reparent, from an examination of Fig. 1, that ambent head portion 22 for a purpose hereinafter ple clearance is provided between the brake head 5 referred to. and truck frame as the brakes move to their The brake head ill is provided with extension released position.

ears 23 and 24, top and bottom, each perforated What is claimed is:

to accommodate a bolt 25. The bolts 25 are dis- 1. The combination comprising a brake head posed with their heads 26 toward the wheel or having a brake shoe secured thereto by akey, and 55 35 the hanger is connected to a brake beam (not It will be seen that the bolts 25 positively 35.:

removable abutment means for retaining the key properly in place comprising a member having threads and secured by such threads.

2. The combination comprising a brake head having a brake shoe secured thereto by a key, and

4. The combination comprising a brake head,

a brake shoe secured to the brake head by a key, an extension on the brake head, a removable bolt penetrating the extension and preventing withdrawal of said key, and means securing the bolt 20 to the extension comprising a self-locking tapered nut.

5. The combination comprising a brake head, a brake shoe secured to the brake head by a key, an extension on the brake head, a removable bolt 25 having a head and penetrating the extension adapted to prevent withdrawal of said key, and means securing the bolt to the extension comprising a lockwasher under the head of the bolt on one side of the extension and a self-locking tapered nut engaging a conical bearing on the opposite side of the extension.

6. The combination comprising a brake head, a plurality of brake shoes secured to the brake head by separate keys, and removable means on the 5 head independent of the keys and preventing withdrawal thereof and disposed in abutting relation to the ends of the respective keys.

7. The combination comprising a brake head, two brake shoes mounted on the brake head, separate brake shoe keys securing the brake shoes individually to the brake head and inserted therein in opposite directions from the top and bottom respectively, and means on the brake head preventing withdrawal of said keys comprising 45 individually removable bolt members in direct end-abutting relation to the respective brake shoe keys.

8. The combination comprising a brake head, two brake shoes mounted on the brake head, sep- 50 arate brake shoe keys individually securing the brake shoes to the brake head and inserted therein in opposing relation from the top and bottom respectively, extensions top and bottom on the brake head, and individually removable bolt 55 members penetrating said extensions and providing fixed abutmentsdirectly in the path of movement o the respective brake shoe keys.

9. The combination comprising a brake head, two brake shoes mounted on the brake head, sep- 0 arate brake shoe keys individually securing the brake shoes to the brake head and inserted therein in opposing relation from the top and bottom respectively, extensions top and bottom on the brake head, and individually removable bolt members penetrating said extensions and preventing withdrawal of the respective brake shoe keys, said bolt members each having a head in abutting relation to the respective keys and secured to said extensions by a lockwasher under the respective heads on one side of the extensions and self-locking tapered nuts engaging conical seats on the opposite side of the respective extensions.

10. The combination comprising a brake head, a brake shoe secured to the brake head by a key, an extension on the brake head, and a removable bolt penetrating said extension having a head in abutting relation to said key adapted to prevent withdrawal of the key.

11. The combination comprising a brake head, a brake shoe secured to the brake head by a key, an extension on the brake head, a removable bolt penetrating the extension having a head in abutting relation to said key preventing withdrawal of the key, and means securing the bolt to the extension comprising a lockwasher under the bolt head on one side of said extension and a nut threaded on the bolt on the opposite side of the extension.

12. The combination comprising a brake head, a brake shoe secured to the brake head by a key, and a removable bolt secured to said brake head by a threaded nutand having a head in abutting relation to said key adapted to prevent withdrawal thereof.

13. The combination comprising a brake head, a brake shoe secured to the brake head by a removable key, and a bolt removably secured to said brake head in direct end-abutting relation to said key.

14. The combination comprising a brake head, two brake shoes mounted on the brake head, separate removable brake shoe keys individually securing the brake shoes to the brake head and inserted therein in opposing relation from the top and bottom respectively, and individually removable boit members secured to the brake head in direct end-abutting relation to the respective brake shoe keys.

15. The combination comprising a brake head, two brake shoes mounted on the brake head, separate brake shoe keys securing the brake shoes to the brake head and inserted therein in opposing relation from the top and bottom respectively, and removable means on the brake head independent of the respective brake shoe keys disposed in end-abutting relation to said keys.

16. The combination comprising a brake head, a brake shoe secured to the head by a removable key, and removable means on the brake head independently of the key disposed in end-abutting relation to said key.

17. The combination comprising a brake head, a brake shoe secured to the brake head by a removable key, and a bolt removably secured to the brake head to prevent withdrawal of said key disposed in end-abutting relation to the key.

ORMAH R. MITCHLL. 

